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Does Large Genome Size Limit Speciation in Endemic Island Floras?

机译:大基因组大小是否会限制特有岛屿植物区系的物种形成?

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Genome sizes in plants vary by several orders of magnitude, and this diversity may have evolutionary consequences. Large genomes contain mainly noncoding DNA that may impose high energy and metabolic costs for their bearers. Here we test the large genome constraint hypothesis, which assumes that plant lineages with large genomes are diversifying more slowly Knight et al. (2005), using endemic floras of the oceanic archipelagos of the Canaries, Hawaii, and Marquesas Islands. In line with this hypothesis, the number of endemic species per genus is negatively correlated with genus-average genome size for island radiations on Hawaiian and Marquesas archipelagos. However, we do not find this correlation on the Canaries, which are close to the continent and therefore have higher immigration rate and lower endemism compared to Hawaii. Further work on a larger number of floras is required to test the generality of the large genome constraint hypothesis.
机译:植物中的基因组大小相差几个数量级,这种多样性可能会带来进化的后果。大型基因组主要包含非编码DNA,可能对其载体施加高能量和代谢成本。在这里,我们测试了大型基因组约束假设,该假设假设具有大型基因组的植物谱系的分化速度较慢。 (2005年),利用加那利群岛,夏威夷群岛和马克斯萨斯群岛的海洋群岛特有植物群。与该假设相符,夏威夷和马克斯群岛群岛上的岛屿辐射,每个属的特有物种数量与属平均基因组大小负相关。但是,我们在加那利群岛(Canaries)上没有发现这种相关性,加那利群岛靠近该大陆,因此与夏威夷相比,移民率更高,地方性流行率更低。需要对大量菌群做进一步的工作,以测试大基因组限制假设的普遍性。

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